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Spin-orbit Coupling for Tidally Evolving Super-Earths

Rodriguez, Adrian and Callegari jr., Nelson and Michtchenko, Tatiana and Hussmann, Hauke (2012) Spin-orbit Coupling for Tidally Evolving Super-Earths. Monthly Notices of the Royal Astronomical Society, 427, pp. 2239-2250. DOI: 10.1111/j.1365-2966.2012.22084.x.

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Abstract

We investigate the spin behaviour of close-in rocky planets and the implications for their orbital evolution. Considering that the planet rotation evolves under simultaneous actions of the torque due to the equatorial deformation and the tidal torque, both raised by the central star, we analyse the possibility of temporary captures in spin–orbit resonances. The results of the numerical simulations of the exact equations of motions indicate that, whenever the planet rotation is trapped in a resonant motion, the orbital decay and the eccentricity damping are faster than the ones in which the rotation follows the so-called pseudo-synchronization. Analytical results obtained through the averaged equations of the spin–orbit problem show a good agreement with the numerical simulations. We apply the analysis to the cases of the recently discovered hot super-Earths Kepler-10 b, GJ 3634 b and 55 Cnc e. The simulated dynamical history of these systems indicates the possibility of capture in several spin–orbit resonances; particularly, GJ 3634 b and 55 Cnc e can currently evolve under a non-synchronous resonant motion for suitable values of the parameters. Moreover, 55 Cnc e may avoid a chaotic rotation behaviour by evolving towards synchronization through successive temporary resonant trappings.

Document Type:Article
Title:Spin-orbit Coupling for Tidally Evolving Super-Earths
Authors:
AuthorsInstitution or Email of Authors
Rodriguez, AdrianUniversity of Sao Paulo
Callegari jr., NelsonUnesp-Univ Estadual Paulista, Rio Claro, SP, Brazil
Michtchenko, TatianaUniversity of Sao Paulo
Hussmann, Haukehauke.hussmann@dlr.de
Date:December 2012
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:427
DOI:10.1111/j.1365-2966.2012.22084.x
Page Range:pp. 2239-2250
Status:Published
Keywords:Gezeiten; Extrasolare Planeten; Rotationszustände
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geodesy
Deposited By: Dr. Hauke Hußmann
Deposited On:04 Dec 2012 11:25
Last Modified:04 Apr 2013 16:41

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